How would I like to see the world end...
Divided between Zombie (but not your typical slow zombies, heck no, these guys can sense fear 100miles away and have tiger like claws and teeth that could chew through steel.)
Or an Alien invasion (Humans Vs Protoss)OR(Humans Vs Zerg).

Dolphins are assholes. I'm good with them swimming around in the ocean quacking at each other. If they start growing thumbs I'm going to wipe them out with net fishing before they turn me into a sex slave. If you doubt me, do a Google search on "dolphin rape" and you'll find that they're not smiling to be cute, but because they are perverts.